Very true brother. Tempted to do the same. Might just go WiFi only if this is the case. Don't ever use GPS on my iPad and with continuity, my iPad will always be connected anyway. Don't know if it's worth the extra $130 plus $10 a month with AT&T.
I thought about going WiFi only, but I do not plan on upgrading this iPad for quite some time, and I don't want to risk wanting it later, when its not that much more after the $100 dollar credit. You never know what you might want/need in the future.