That's not true at all.
SUSE offers SUSE Linux Enterprise (Server,Desktop,POS,SAP, etc) with 7 years of support. If you pay extra, it can be supported for up to 10 years. There's even a stripped-down version of SLE for Point-of-Sale machines. See http://www.suse.com/sles
On the free side of things, most LTS/Stable releases should get at least 3 years of security updates.
Check your facts first.