Same contract advertised by multiple agencies

[MrMarkyMark]

I reply to all of them.
The first one to answer it's the one I get.

Anything wrong with is?

Yes, plenty.

Take one example.......

Sometimes, there may be a number of different roles going, at a client.
Some agencies will handle the, more, junior roles, the more prestigious(?!) agencies the more senior.

I had this before, the rates ranged from £350 to £600.
I went with the agency for the senior role and got it.

If I had applied to all the agencies no one would have known where I was pitching.
Was I "worth" £350 or the £600?