Why lay -110 on bets instead of -105?

We all know the "juice" is what kills you, over time! Many Sportsbooks offer outrageous "sign up bonus $". I think a better offer is -105 lines FOREVER! You can get that if you go to callmemrx.com/where . If you click on the banner for "LooseLines" you can get to lay -105 if you sign up in the next week. While the time to sign up is limited, the -105 offer is permanent! So even if you open an account now with a small amount, you will always get the -105 down the road. That's pretty sweet.