Yeah, sounds like a fair deal for both sides.

Today 100% of the guards I've found were 8.7m ones (so far). It's realy annoying 'cause I'm totally stuck.
Yesterday I bougth an Elixir with Pero, and used on a 8.7 guard...
...and then I got another 8.7m guard immediately after.

Well, I'm not gonna try that again, lol