Suarez and Arsenal were a different case, Liverpool questioned the validity of the clause, Suarez wanted to move to Arsenal.
Also I doubt any club would be stupid to trigger his clause without getting his consent to sign.
I was always under the impression that Suarez wasn't that arsed that Liverpool rebuffed Arsenal, at least not enough to pursue legal action, and was happy with an improved contract and the agreement to be allowed to be sold to one of the Spanish giants in the near future.
Triggering a release clause only has any value if the player wants to move and a compromise cannot be reached, so the club either sells him or faces legal action.
Edit: I know in Spain buy out clauses are a little different where the sum is paid to the league for the player to release himself from the contract, so the player is in a much stronger position to force through a move quickly.