[exelius]

Sounds like two things here:

With #1 you found a problem, but failed to find a market. It's hard to say without knowing the product and/or situation, but it sounds like your product was in the unfortunate position of being an enterprise B2B product that was not solving a problem in the SMB space. The typical strategy for a B2B product is to sell it to SMBs early on, then use that revenue to fund the massive feature set that large enterprises usually need. This is one of the things that happens in startups -- sometimes you don't know your market is a dud until after you have a product. It's not a sure thing.

With #2, you just didn't have a large enough sample set. Response rates for e-mails collected via landing pages like this are around 1-2% in my experience. It's a bit of a chicken and egg problem to be honest, and it's hard enough that many startups will throw a marketing budget into it.