Picking, packing and transporting...
The amount of labor involved in harvesting for market is something that blew me away when helping out at my friend's farm. I just couldn't imagine it until I was out there on harvest day. Growing is really a small part of the effort, compared to getting the stuff ready for market.
Ultimately, your wages will come down to: How fast can I make a bouquet.
I wouldn't personally invest heavily in this sort of plan unless I had already done a trial run of the time to pick/pack what I needed to earn a decent wage from the trip to market.
But for me I guess that's hindsight 20/20... I am not so quick with knife or scissors as it turns out.
I enjoy the work but my livelihood doesn't depend on it... the full time farm workers are fast like the wind to make just basic wages.