If it's helping you get ready for the work sets, I don't see an issue. If by the time you've rescued the work set you're tired, its too much.
I use something similar but with way less reps.
For deadlifts if my work set is 225 kg, for example, I'll probably go
Until very recently I'd just use 20 kg increments above 100 kg but it took too long so I cut it down. That seems to work fine, and I haven't noticed a difference either way.
For squat I'll start with the empty bar for a couple of sets, same for bench.