I agree on there being too many variables. If I was setting up sq.ft. pricing, I'd probably look at range pricing - e.g. "From $10 / sq.ft." - that way, you don't find yourself in a pickle.
I love having standardized pricing - this makes it easy for me and the customer. But this is more of a specialty project.
A few things to keep in mind:
- As I understand it, vinyl manufacturers don't warranty materials on horizontal installation. I could be wrong here, but double check.
- Tables provide a wide array of substrates and have different textures, which affect adhesion and install. I've found some textured tops are easy to install (natural air egress), but you use a lot more heat to get good adhesion. Certain finishes require a wet install. Etc., etc., etc.
- If you want the fast, easy install, you'll have to go in their off hours. They're not going to want you installing during business hours most likely. (price accordingly)
- Get a signed waiver concerning removal. Depending on the table surface, it can be jacked up when removing the vinyl. I did some tests for a customer on wood surfaces with a clear vinyl, and it was almost impossible to remove without taking off bits of the finish. You don't want to be on the hook for replacing their tables down the line.
- To my knowledge, this is a wide-open niche in the industry. I haven't heard about a lot of competition out there. Especially if this is new in the area, you'll set the prices, but the next sign guy will come along and undercut you. So don't go too cheap, or you'll lose in the long run.