I have never been in Lagoa. I have been traveling to RJ one or twice per year during the last seven years, and visited several times 117 and 202 during those trips. I do not notice a drop in the "estethic" quality of the offer, but the muscular clean IG types are not my favorite type. I do see them, though. Perhaps I notice less of those guys in 117, but not in 202.
I wonder whether this drop in the quality is noticeable only for the travelers with a longer history traveling to Brazil.
PS: by the way, I agree with @floridarob. I've never paid more than 200 Rials in a sauna. And the boys who come to my place and hang out and play for long hours, are always happy with 300 Rials.
However, @floridarob may be judgmental about tourists overpaying. The GPs have differentiated fees for local and foreigners, and for "cool" and "not so cool" clients, who is visiting Rio once and who is a regular who travels often, who is generous with tips and extras and who is not, etc. Their fees system maybe more complicated and wiser than we comprehend.
I know that some of my GPs would do things with me that would never do with other clients, or that would never do it for the same price. I know this not because the garotos told me, but because of the clients. That is why I feel less comfortable now sharing the fees I pay and the things I do in detail.