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I ask because I realized yesterday that I had left lockout on for hours of riding at a bmx style track hitting jumps and wallrides.

I found the lockout helped a lot and I'll continue using it for that if it doesn't damage my shocks.

EDIT: The exact model of fork I have is

Rock Shox 30 Silver TK Solo Air
Tapered Steerer / Remote Lockout
Reb. Adj. / 100mm travel
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    Rockshox makes a variety of shocks. You should be more specific as to the type you're running. – Batman Jun 26 '16 at 17:06
  • If locking out the shock feels better on a bumpy track, then you don't really need the shock... but you're still carrying it about. – Criggie Jun 26 '16 at 20:01
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    @Batman, I updated my question with the exact model of fork. My bike is a scott scale 760. – Thomas Dignan Jun 26 '16 at 21:21
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    @Criggie bmx / pump tracks are actually pretty smooth with small hills, a very different type of 'bumpy' to trail riding. – Nic Jun 26 '16 at 21:42
  • @nic that's my point. There's little reason to carry the weight of the shock around the track, which is why BMX don't come with suspension. If this is OP's main riding, then a rigid will be lighter. – Criggie Jun 27 '16 at 0:56
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First, you should understand how suspensions with lockouts work. Fluid suspensions(oil or air) like yours have a valve inside them that lets the fluid flow through at a constricted rate on the way up, and very quickly on the way down. This is what gives the dampening effect on suspensions. Lockouts effectively completely close off that valve.
However, obviously the valve is not infinitely strong. At some point, it will give way and let the air through. This is where blow-offs come in. Blow-off basically refers to that point where the lockout 'fails' and dampens the shock anyway.
The model you have has something called TurnKey which is Rock Shox patented name for blow-off. It has an adjustable blow-off point which will let you set the amount of force required for the blow-off to occur.
Now that you know how these systems work, consider your case of riding your MTB as a BMX on a track. If you set the turnkey/blowoff too low, you'll risk it suddenly dropping on a big landing and if you are taking a turn or something immediately after, you can risk losing your balance. If you set it too high, you probably can damage the valve in the shocks by stressing it too much.
So to conclude, not really, riding on the lockout won't affect the suspension too much because as soon as the wheel hits something too hard, the lockout will 'fail' and go back to normal damping as long as you don't set the blow-off so high that it is practically impossible to hit the bow-off. Just don't set it so low you hit the drop-off all the time and defeat the point of locking out.

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