Indeed. The idea that 80-odd grand isn't enough so we'll need to pay them to avoid them having second jobs is a piss take. They should be banned from having second jobs anyway. They should also be banned from taking money for campaigning above a certain (low) value from any single organisation or business, and banned from taking jobs at any organisation that might represent a conflict of interest for a significant period of time after they leave office to prevent favours for jobs. Anyone who does this should be investigated for corruption. They should also be banned from appointing people to the House of Lords if they have been legitimately voted out in an election. It's ridiculous that the electorate can vote someone out and the party can turn around and say "fuck you, you're having them anyway." (In reality an unelected HoL shouldn't exist anyway, but that's another story).
The MP salary is there to ensure that all members of society can become an MP without any financial penalty. It is already more than enough of an incentive for working class people and middle class people to consider it a very prestigious job. It's the same as a consultant doctor ffs, and much more when you take into account all of the bonuses involved. The only people who seem to have a problem with the salary are toffs who were expecting a six-figure salary to do fuck all at daddy's friend's company the second they left university.
There's this idea that paying people more removes corruption. No, harsh legal penalties get rid of corruption. It amazes me that Owen Paterson isn't able to be legally prosecuted for what he did, for example, and it's just a matter of breaking parliamentary rules.