Hi...
Just a thought, but perhaps printing out your post and asking him to read it would help...you've expressed yourself very well, clearly and honestly.
Most likely it will start a heart-to-heart talk. At least I hope it does...

Jmo, but your feelings about it should be honored. As you've said, this is a source of a great deal of stress for you. Is it really worth going ahead with this when it's only going to cause you more stress?
At this stage of my life, I wouldn't want to do this, either.

While I appreciate your husband wanting to make money, the personal cost to you may be a very high price to pay... and that to me is not a good trade-off.

In Peace