If you think it's common practice for NFL teams to sign guys to tenders that they plan to cut later on so they can sign them to a deal for half the money then there is no point in discussing this further because NFL teams most certainly do NOT do that. As I said, doing that screws the players. In an era where being able to sign free agents is very important to team success intentionally screw players and pissing off players and their agents with a tactic like that would be batshit crazy.
Just as an example, last year the Stillers offered tenders to three players. All three of those players, Will Johnson, Robert Golden and Antwon Blake, remained under contract to the Stillers at the terms of the tenders they signed for the full season. On the other hand, in 2016 and 2014 the Stillers did not offer a tender to any of their restricted free agents.
There is indeed someone here who does not understand how tenders are used. But it's not who you think it is.