Just no such thing as FREE LUNCH. This is an expensive biz to get into. No way around that.
Even 20 or so cans of 1-Shot will set you back a nice chunk of change, and you have the skills and experience to back that up.
It also doesn't mean that you need the solvent printer... there's something called outsourcing... I do it all the time. I can do pretty much everything. I only own a 24" Graphtec plotter. I have a source for everything else. If I had the customers (and cash flow) I'd plunk down $30,000 for a solvent printer without a second thought. I question the wisdom of spending $15,000 for even an entry level machine without an established customer base or a second thought.
Too many people think, "buy the equipment, the customers will beat a path to my door" Where I come from, there's a word for that sort of thinking, "bankrupt".