ChangeIP.com started around the same time as dyndns.org. We just grew slower which ended up allowing us to support our customers better.
1 - We charge a lot less than them.
2 - We provide support for free for Mikrotik users.
3 - We provide scripts that work reliably with RouterOS.
4 - 90% of the RouterOS boxes updating our systems would get locked out in a minute with dyndns's policies.
5 - We participate in the forums for a better end user experience. Ask dyndns.org about RouterOS and they won't even know what it is.
6 - We are built into many hardware devices. Routerboard, SonicWall, SONY LocationFree TV (Exclusive OEM), PCO DVRs, HoneyWell DVRs, Toshiba cameras & DVRs, Crestron home automation brains, many DLinks, anything using ddclient (embedded), draytek routers, lancom, netscreen, speedtouch, ubicom, trendnet, and many others.
Surly it cant be that hard to make a script.
No one is stopping anyone from making a script... it's just that no one has or wants to. Go for it : )