Good because otherwise I'd have a lot of sales tax to refund to my customers, lol.
As far as the fertilizer goes, it really doesn't do much good to be able to only spread straight fertilizer, except when you repair or install a lawn you can put down starter fertilizer. You'd also be able to fertilize flower beds. But putting down fertilizer in the spring without a pre-emergent to control crab grass would probably not be doing your customer much of a service. No weed control, grub control, round-up etc.