SharpPLM (document and quote management for small/med manufacturing companies) is still pretty early but I make $200/month. I feel like I am still figuring out product/market fit.
How early are you if you don't mind me asking? Are your secondary plans ready to go? (I assume you only have your current customers on the lowest plan based on your revenue)
I'm pretty early since I only work on it part-time and I'm learning marketing/sales at the same time as this. I want to get a few more customers to prove out the product fit before putting a bunch of resources into adwords, etc.
How are you marketing it/planning to market it?
You must have just hit my site? I noticed someone was on it from Palo Alto. Anyway, I'm mostly doing calling and emailing of networks and local businesses. Why do you ask? If you're interested in more info, drop me a line scott@companyname.com.