Both of these signs are currently standing at Caesar's properties.
This one is at Harrah's:
Seems okay if you don't understand how odds work.
However, if you do, you realize that Harrah's is bragging about a
50% chance of fun at their property, since 1:1 odds mean a 50-50 chance.
The second one is less of a marketing fail and more of a pricing/promotional fail:
This sign is sitting in several areas of the Rio.
Again, nothing seems wrong with it at first glance...
... until you realize that the best deal is buying the least amount of credits!
You get $50 in credits for $35.
You get $100 in credits for $75.
You get $200 in credits for $150.
Aside from being pointless to commit to $200 if you can simply buy $100 twice for the same price, the worst fail here is the fact that
you can buy $50 twice and save $5 over buying $100. So you can simply purchase two $50 credit packages for $70, rather than spending $75 for $100 in credit. Not only that, you will have the flexibility of only buying $50 at first, and only buying the second $50 if you need it!
From what I can tell, you can buy as many of these as you want, so it's not a matter of the first $50 being cheaper because you can't take advantage of it more than once. I believe they just give you a card or something that gives you $50 in credit, and you can keep buying them to your heart's content.
This isn't even a matter of having to go through a lot of trouble to save $5. There is simply NO REASON to ever buy a $100 card for $75 when you can buy two $50s for $70.