The other thing to remember if you are using an email campaign is free is a word often blocked by spam checkers so your messages will not get through.
If people cannot afford you product or service don't let them waste your time, it is better spent your energy nurturing customers who do have money, to be honest people who want to succeed will find the money. Some people will even hold a garage sale to start their business.
The stark fact is you cannot start any kind of business without money online is no different to offline. You need to put your money where your mouth is and yes it also means you have to work at it. It might take a minimum of six months before you get a return on your investment and longer to get into profit. Offline it takes years to get into profit and the costs are greater.
So now you see why free does not work.