Should be a whole ship charter.
I hope whoever wants to go does the math and decides if Bret Michaels is worth it. I sure can't see how it is justified.
His 4-night cruise starts at $1100 per person for an inside cabin. This includes gratuities but otherwise just gives the person a farewell cocktail party and admission to his performance. Otherwise it is a normal cruise.
The 5-night cruise which boards on November 14 starts at $400 for an inside cabin if you choose to include gratuities in your booking fee.
So, for $700 you get a couple of drinks, a shorter cruise, and a Bret Michaels concert. I guess more math would show what his possible cut of the action is. Plus, one of the caveats in the contract says if the headline entertainment has to cancel they reserve the right to substitute.
Finally, the deposit is 25% and once you book anything you pay is non-refundable. 25% more is due at the end of January, another 25% in March, and the final 25% in May. You have to buy the insurance to get your money back.