The Vector Art wins hands down. The VA collection is compliled with the consideration of sign makers BY sign makers (or artists with knowledge of the industry). The other collections are basically bastardized.
Are the other collections junk, not really, but as Fred points out - they were not intended for this industry. Selling these collections to the sign industry is just another method used to keep revenues flowing. That makes a difference when it comes to using them. When you have to go through too much unsatisfactory stuff, to find that "one" - you will tend to shy away from even looking. Time is money.
With that said, and the the presence of
www.expressclipart.com, why would you want to buy any collection anyway? Buy what you need, when you need. Double, triple, even quadruple your outlay. It is far more profitable for you that way. Most of us that have collections have them because that was the ONLY way you could get anything. As a matter of fact, Roland did at one time sell individual images - until their distributors got pissed off, and rightfully so. Collections are a thing of the past.
Fred - I too have seen the VA collection for $200, many times. It varies as to who and where. Maybe a loss leader, or maybe to keep volume up (if there are such requirements - don't know) - but they are there. NO seller offers what you offer, ie: individual images, and the publication of truly individual artists. Your new service is far more advantageous to a buyer, avoiding the huge outlay of cash - for that "one" image.