A business or course logo ball is part of the advertising for the business or course. It's a promotion. If people find it's good enough to play all the time it becomes an even more successful result of their advertising with every repeat sale of the logo product. An even more effective use of those advertising dollars since the logo is then viewed multiple times by others and beyond the time constraints of the original promotion.
As for changing it to the ball you normally play, that is simply not the purpose of the giveaways.
Thinking outside the box for a moment, though, it would be an interesting idea to have WGT work out the programming and sign an advertising deal with a company like Transamerica to offer a Transamerica logo alongside the ball manufacturer's logo for a reduced price at the time of purchase. Something along the lines of , "Buy any sleeve, agree to add the extra advertising to it, get 5% off the price." WGT could then pick up that 5% from the advertiser so they don't lose any income on the deal.