In time I would like to branch out into multiple niches, but am unsure whether I can do this using one company name. If I am effectively emailing various lists (who have bought different niche products and are categorised into separate email lists), would it be best to use different email addresses and company names for each niche? I am unsure what to do, as I do not wish to appear to deceive anyone, but do not want to be protrayed as an expert in every area.

This is the standard affiliate marketing structure. In this program, the merchant pays the affiliate a percentage of the sale price of the product after the consumer purchases the product as a result of the affiliate’s marketing strategies. In other words, the affiliate must actually get the investor to invest in the product before they are compensated.
Another one of the highest paying and most popular dating affiliate programs is eHarmony, which is based on the actual earnings that can be made from each referred sale. Up to $188 can be made from a single sale. In general, the members at eHarmony are typically looking to find serious long term relationships, so many of them are willing to pay extra to find similar people.
Focus on reviewing products and services that fall within your niche. Then, leveraging the rapport you have created with your audience and your stance as an expert, tell your readers why they would benefit from purchasing the product or service you are promoting. Almost anything sold online can be reviewed if there is an affiliate program – you can review physical products, digital software, or even services booked online, like ride sharing or travel resort booking. It is especially effective to compare this product to others in the same category. Most importantly, make sure you are generating detailed, articulate content to improve conversions.
Colmex Pro is the leading European Regulated CFD Broker. Offering Tier 2 CFD’s, as well as Live Equities, Indices, Commodities, Futures, and Forex, Colmex Pro offers nearly every investment vehicle available on the US Stock Market to international day traders. Coupled with their partner’s educational packages and trade room access Colmex Pro offers investors the best opportunity to grow and learn how to day trade successfully. CPA up to $1000
MaxBounty works exclusively with digital products, usually about giving one’s email or signing up for a newsletter. MaxBounty has CPA, Pay-per-call, and CPL campaigns that you can choose from. MaxBounty is involved in a large number of verticals, including market research, real estate, social games, finance, dating, and diet, but is primarily designed for marketers seeking to acquire new leads.
OK, here's where things get even crazier! With FunnelBots, you can sell my resell rights products (7 softwares that cost me over $17k to build)... but for the launch  period, we're also giving you bonus AND give-away rights, so you can  give access to these tools away as  bonuses for when people buy your products, OR even as give-away rights, so you can use them as "lead magnets" so people who sign up to your list and get up to 7x software tools. Wow!
You should also make sure you aren't competing with your own affiliates for eyeballs. Any marketing channels you're using, such as search engines, content sites or e-mail lists, should be off limits to your affiliates. Put marketing restrictions into your affiliate agreement and notify partners immediately. It's your program--you set the rules. Or, if you prefer, you can let your affiliates run the majority of your internet marketing.
In 2006, the most active sectors for affiliate marketing were the adult gambling, retail industries and file-sharing services.[21]:149–150 The three sectors expected to experience the greatest growth are the mobile phone, finance, and travel sectors.[21] Soon after these sectors came the entertainment (particularly gaming) and Internet-related services (particularly broadband) sectors. Also several of the affiliate solution providers expect to see increased interest from business-to-business marketers and advertisers in using affiliate marketing as part of their mix.[21]:149–150
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