For what it’s worth, about a year ago I set myself a personal goal of making at least as many IDs as I made observations of my own. I got there, after a couple of months if I remember correctly. I was convinced to set this goal for myself because while making the observation in the first place is loads of fun, getting the feedback from identifiers taught me even more and deepened my connection to the natural world. So, I figured that if I want other people to feel connected as well, I had better contribute IDs, not just observations.
I mostly make IDs in Massachusetts, USA, where I live, or in New England, and even though there are many, many iNatters who make IDs by the thousands in this region (why, hello, tsn!), there were plenty of easy IDs left to make. I’m not a specialist in any taxon, but I can ID such common species as Eastern Gray Squirrel, Monarch, and Pickerelweed - and there were still thousands of these easy IDs left to make. If I can do that in a region which is intensively iNatted, I think it should be easy to make thousands of IDs in most places in North America, for example.
As for incentivizing identifiers, well, I’m just thankful iNat provides me with something fun to do when it’s rainy, snowy, or dark (or when I’m stuck on hold for those dreaded necessary phone calls).