i think it's a great idea seeming as how much hard work gets put into scripts which do amazing stuff. Seeming as some people sell their games, the scripts should be sold aswell so script makers get some credit for their work also.
I didn't have a clue that this was going on but I'd be happy to put some money into my game for the amount it's worth to get some help into making it unique and special.
It is all about if you want your game to be taken seriously or not really, if you just want it to be like another simple rmxp game then you wouldn't pay for resources but if you want your game to really stand out then you would pay for resources which you will obviously have legal rights to use them because you payed for them fair and square.
Good idea, just don't price them too high.
