Miculek has sponsors paying for 100,000 rounds a year. I fire 1% of that centerfire and maybe 2-3% 22lr in a very good year.
If you're only shooting 1000 rds of centerfire a year, I'd argue you should save money on guns and do more shooting.
Plenty of other people have decided this modification is worth their while.
Plenty of people do plenty of things. It doesn't mean you should always emulate them. The effectiveness of doing the long slide on the short grip seems more anecdotal than anything else. Slow fire on a static range at a nice bullseye target at 25 yards and I imagine you might well notice the difference. At the ranges typical in a defensive shooting? I'd be pretty surprised. Rules of 3s is 3 shots at 3 yards in 3 seconds. You don't need a G17 slide to do that. If anything it might be a little slower getting on target. But if you want to do it it's your coin. I think you have your answer as to which is the cheaper route.