I think your location and the rest of your flying profile have a lot to do with how useful the CRI is.
I do okay - frankly I couldn't find the time to do more than 50hrs.pa, and 30 is fine. Much of that flying is through a couple of syndicates who like having me in-house, and having a lot of time in some relatively obscure types - 3-axis microlights, vintage taildraggers, that sort of thing. So I am in sufficient demand to make my life interesting.
I'm happy to be proved wrong, but my suspicion is that a CRI whose hours are almost entirely in standard CessPits is going to struggle to get much instructing, as they're a lot less useful than an FI with the same types. As most of my instructing is on types where the pilots are usually already qualified before they come to them, it matters a lot less to me.
G