I did the math and if I sell my $50 gift card on Raise for $49 (2% off, which is the "going rate"), I will net $43.12 after they take their commission. Then, I can take that and use the BB QR code to buy a Disney gift card and earn the 600 SB so my net "loss" will only be $0.88. I guess that my vacation account can take that hit. I never paid any money for the gift card so I technically did not "lose" any money in this deal. I just can't use it towards the intended purpose.
I am fairly certain that the rewards certificates cannot be sold so I will have to spend those on something at BB, but I'm sure I'll find something. I'm not sure what I will do with my other $25 BB gift card. I'm going to hold onto it for now until I let my final BB Visa billing cycle close. Once I figure out what my final amount of rewards will be, I will figure out what I might want to buy. If I need the $25 to get it, I will keep the gift card. If not, I will sell it on Raise and by then, I should have another $25 in SB to cash out to PayPal so I can combine it and get another $50 Disney gift card.