So long as you don't "reward" yourself with a celebratory drink, why not? ;-)
Obviously, when we don't drink we save money that could be spent on more tangible things. Healthy things. For me, that might be something like a pricey bath product that I love that I wouldn't normally spend money on.
Some people like to get some sort of ******** - a piece of jewelry or something - that will remind them of their sobriety whenever they look at it. Sometimes having these things we can visualize can make us think twice about taking a drink.
Best of luck to you!