Short answer: this is a known, accepted Ottoneu Fantasy Baseball strategy and anyone not re-auctioning players after 30 days should do that to lesser their cap penalty burden.
Long answer: There is a reason it took 30 days to auction Gurriel the second time - the system will not let you auction a player you cut less than 30 days ago. If after 30 days no one in the league wants the player at the current minimum, then the original team should be afforded some cap relief in order to move their team forward. They are still losing the production of what they thought would be a $16 player in this case, so they are still penalized to an extent. The 30-day rule is just meant to lessen that penalty without removing it completely.