You've heard from many veteran and very successful real estate professionals who have been thought through experiences, 'Never Pay For A Lead." Each of these agents, myself included, know we are better able to get responses from those most likely to do business with us.
For all we know, the leads you are supplying could be from an Ad that simply states, "If you are a homeowner or are looking for a home, sign up for your Free gift." However, I do like your offer to apply the lead fee as a credit taken from the referral.
Now, the greatest issue in regards to lead generation, for those who are selling such leads, is realizing the ability of the agent to properly cultivate and mature the contact into a business position is essential. A perfectly good lead can be ignored to death. While a truly inappropriate lead consumes time and resources only to evaporate overnight.
Until you are able to breach this chasm of uncertainty, the professional response will be a resounding no, with the exception of all those newbies who will sign up and be out of business before the next 4th of July.
You, really, really, really, really need to reveal exactly what you bring to the game for a 25%(Wow!) referral fee. This is a dinosaur of a concept too many brokers are grasping onto that will not serve them well.
Now, if you were to prove the integrity of your leads...and NO 25% referral, (that is ridiculous) and a proven 25% conversion rate, I would consider 25 to 50 bucks a pop up to 10 a month. (Don't call)