High End Vs Budget Scope Mounts

[rabbitslayer]

Regarding air rifles, what's the real difference between fitting high end scope mounts (Spuhr, Tier one, BKL etc.) as appose to the cheaper budget brands like Hawke, Atom, Richter Optik, Nikko Sterling that can be had for a tenner or less on fleabay?

The reason I'm asking is that I've always only ever used the cheaper end of the scale and never had any issues with holding long term accuracy whatsoever even on springers.

So, what's the point in spending a lot of money on more expensive brands when the cheaper one's do the job? Is it just marketing or do they offer something more that I'm not aware of?