1) you got lucky, there's usually a bidding war for players like that.
2) You still spend money on a guy that adds little to nothing to your long term developement... for those money you could have gotten a player with say 24 quality aged 20, he'd be a good player for you, he'd develope better markedvalue and he'd improve to a higher level long term.
3) he takes up a spot in the squad, where you don't train (fast enough)... don't tell me that is long term profitable just bcs you maybe get CL next season.

the beauty of freebees (besides the profit) are they are quick in, quick out till you can afford a real talent. You obviously had money for a real top talent and squandered it being impatient.