Hi ladyV, welcome. Yes, I think our members these days are well aware from the many posts in many threads, not always posted in the Driving in Spain ones, many are in General Chat or the newbies sections, that the banks haven't financed car hire companies as much as they (the car hire companies) would like recently.
I've often checked prices however with Carjet & DYS compared with booking direct & I've found booking direct hasn't been cheaper. I guess car hire companies give the likes of Carjet & DYS huge discounts to get bookings through them so, even though Carjet & DYS obviously make something it's still cheaper to book through an agent.
Having been quoted serious money to rent cars recently as we're in Spain over a month each time every couple of months we invested in our own car in June.
** Regarding advertising, which of course you aren't, can I suggest that you put your website as your signature as many do here to help generate revenue for you. That is totally acceptable. You can add text explaining why members should ask you for a quote too, just a couple of lines. Have a look around, see others signatures. Many are blatant with massive text but that's frowned on somewhat.