It is absolutely worth registering for MaM. It has an unparalleled entertainment-to-download size ratio and is the easiest tracker to excel on. It's very easy to reach their invite forum, which branches you off to other nice trackers. I have hundreds of free-leech tokens for Kiwis who want to hit the ground running.
Logging the registration IP is universally constant among private trackers. This is to prevent users from registering accounts and selling them for cash elsewhere, to prevent account sharing (for-profit or otherwise), and to prevent banned users from simply respawning. Trackers typically allow VPN use after initial registration.
You can try subverting the IP check if you wish but at your peril. If you get caught, the tracker will record your ban and may share this information with other trackers they work with. If you have accounts on those other trackers that can be linked to the banned account, they will disable all your accounts in a larger ban wave.
I've never had issues registering and browsing with my real IP address, even after multiple long-distance relocations. It pays to be a good boy