I suspect you are looking at this wrong. I really don't care but I also hate to see someone asking for a far bigger job than they envision. Most pros will have a 30-50hp engine driven compressor which can supply a huge amount of air and keep up the pressure and volume with the blaster going full tilt. No waiting.
If there is any fall off in pressure the grit effectiveness will fall off enormously meaning you will use a lot more grit than you thought.
They will have the aftercooler and filters as part of the package to remove the moisture which WILL cause trouble.
Have you seriously considered how you are going to deal with the dust and mess and if the yard you are in will allow YOU to do it?
YOU will need GOOD protective gear. Good coveralls, serious eye protection, Possibly even a full mask, a GOOD breathing filter. I didn't and I had trouble with grit in my eyes. Not fun. Even with a full face shield, good goggles and my glasses my eyes often got grit in them.
Dust containment is a must or you will have your neighbours not being very neighbourly, including the yard. Disposal could be a problem, ask, because it will now be toxic waste.
If you still decide to go ahead then go for it but do so after having properly checked out ALL that is required.
Of course up to you and if you go ahead just be positive you have considered all of it and not just reacted to the bill, $1,000. Yes, you can spend the time but be sure you ask yourself is your time that cheap and includes all the stuff you will have to buy and deal with.
Have fun.