It seems like a lot of ShareASale merchants are either low on funds or temporarily offline. Does anyone have a programs that have a proven track record with ShareASale?

I think all of the networks have this problem. I try not to promote any program too heavily until I get a few checks from them.

I do the same thing - however I have found programs on SAS that are doing very well for a few months all of a sudden go online.

You have to just keep an eye on your stats.