Superman 32, really, what are you trying to achieve? Are you just doing this for fun? You must be...
If you go and spend 29000 GBP on 500 hours in the right seat of a B-737NG, why should anyone pay you afterwards as opposed to get another chump to plop another 29000 GBP? It's a great additional source of revenue for the airline - imagine, instead of paying a required crew member a salary, they get that required crew member to pay THEM. What a concept!
Again, that's why I think you must be doing this for fun because professionals get paid, and as someone doing this for fun and offering to pay to play, you are screwing over the professional pilots who get paid for this kind of work.