Learnt the hard way that selection of affiliates is something that should be carefully done. Especially on the web, where not many sites have a clear business model.
Why is the business model of the affiliate important for us? Should we not choose the one that costs us less, yet has good features? The answer is no. Sooner or later the service will be forced to shut shop, and you might end up without options. Especially if there is a use of a technology which will lock you out of options apart from redeveloping your product/service.
I have been using Fotopic.net for several years for showcasing image galleries. The site did charge pennies and provided a rich feature set including ability to integrate with your own domain. Its closed now, and all links to those photos on my blog and at other places are out of order. I also have lost pictures – though I will have them in my archive, but searching for each and putting together galleries based on topics (rather than dates) will be a very uphill task.
At least I am wiser now!