It's up to you ... you equate 504 UR to $5, and you're paying $3.95 for that. Are you okay with coming out $1.05 ahead per VR? Take into account drive time and gas.
It's funny, the Ink cards went from being the best UR card for VR (5x via OD) to now the worst ... at least with Freedom you get a 10% bonus and with Sapphire Preferred a 7% bonus.