We are all familiar with technology hardware or software resellers; they are the solution providers that take the best products out there and turn them into turnkey solutions to meet the varied (and specific) technological business needs of their customers. Often tech resellers are not contractually bound to one single vendor, and as such, can find the match the best product line up for their customers. A website reseller is really no different, and can help you take the best of what is available and turn it into adaptable (and profitable) solutions for your growing client base.
A reputable website reseller program does not just resell websites. A good website reseller will help you with as many services (or as few services as you would like) of what it takes to be a strong and successful web designer and developer. This includes hosting, advice and training, marketing tools, client management tools, help with technical issues, support, even billing. Essentially there is a choose your own set of options for whatever support you need.
Website reselling is also more cost effective than trying to juggle all of the elements of a established web development firm in house. With full time in house staff, not only is there staff recruitment and retention to deal with, but there is also ongoing training and employee development that will be required. This is costly and difficult to perfect. Again, proficient website reseller programs should alleviate this dilemma by providing their own suite of expert staff and development.
Last but not least, the website reseller you go to depends, really, on what you are looking for. If you love the design aspect of your business and do not want to relinquish control over that aspect, you do not have to. Meanwhile, if you hate creating SEO savvy content, you can find a website reseller to do that for you instead.