Corporate-sponsored travelers often rent much more than the average bargain-hungry retail weekender. Corporate renters also tend to have lower usage than said weekend day trippers. Corporate contracts therefore bring in considerably more revenue and profit for the rental companies. And that's even with the big discounts offered to them for the purpose of encouraging and rewarding the best customers.

It's not the retail customer who is subsidizing the corporate one, but rather the other way around. Without such business travelers to even out the demand and usage during the week, when most retail customers are at their stationary workplace, rates could be higher on the weekends when the business travelers are at home, and the high usage retail folks come out shopping for bargains.