How Much is Fair to Pay an Envelope Stuffer/Stamper?

I've realized it's time to hire someone to handle our envelopes.

For the person we hire, the letters will be folded, and the envelopes will already be addressed when I hand these items over to them.

They'll just need to put the letters in the envelopes and stamp them.  I always use the "peel seal" envelopes, so they won't need to lick them or put water on them to seal them.

I'm going to post an ad for this, but I'm not sure how much to offer.  

They would be doing about 1,000-1,500 pieces per month.

I've seen people on this forum mentioning 75 cents to a dollar per piece, but I'm not sure how much to reduce the rate since they won't need to hand-address the envelopes.

Maybe 50 cents per piece?  At 1,000 pieces, that's nearly an extra $500 a month for someone, which could be huge.  

Maybe I answered my own question typing-out this post.  :-P