Alan,

Of course there are two big downsides to launching on a Tuesday:

1) Your potential prospects will have their inboxes flooded with so many other offers from other marketers... Assuming they're subscribed to multiple lists

and more importantly

2) Your potential JV partners are less likely to mail for you as they could well be already committed to another JV partners launch happening on the same day... Someone they have a far longer relationship with.

Its a difficult one, but it maybe worth going on another day just to get people to support you, and then once you're established in say 12 months time, then book your launch on a Tuesday - giving plenty of notice to your grade A partners.