I don't understand this spray and pray approach to business - I'm not businessman so I may be talking out my ass - but I would have thought business is like a long term relationship. May as well have a spreadsheet of 50 failed marriages. If you aren't in it for the long haul what are you doing?
You have to start somewhere and try things out to find a business bringing revenue. And yes, it is "spray and pray" in essence. And I see nothing wrong with it. (probably because I tried to launch a similar number if not more of such "businesses"/projects and continue doing so)