I agree with what other posters said. I am also going to add to their points.
CVS will never pay for an independent pharmacy that is non-compete. They will also never pay for anything that they don't see the value in, but wont short change you also. However you are not the owner. I suspect that they don't really care about you and will get this deal signed either way (owner definitely has to sign non compete). Getting you as a staff pharmacist to do a non-compete is just a bonus...If you don't sign it, okay... you wont get a job. If you sign it, you get a job, they may increase customer retention and acquisition will go easier so the value of the deal is more.
In other words, they always win..., but not by much. The idea is to be fair but also win because they don't want the independent owner to be un-happy and badmouth them. There is a formula for acquisition that takes into account of many variables such as estimated script retention, amount of narcs filled, etc. They have real estate teams comprised of very experienced and good people (that is how CVS grew so fast), and in addition, the deal has to go through and be approved by a lot of people.
So if they offer you 25k (which is the maximum incentive that I have seen and received myself), that is the most you are going to get. You will not get 250k. You can negotiate for a higher salary, or more vacation days.
Like other poster have said, customer says a lot of things. Do not believe any of it. Ultimately, I will be surprised if you retain any customers. There is a lot that goes into opening an independent pharmacy. You might not be operational because of many bumps (ie applying for insurances), for a while..., and customers are not going to wait.
Also lastly, your pharmacy might have done so well because it was the only pharmacy in town. Once another pharmacy opens..., people have options.