Certainly within dosing guidelines. If indicated, appropriately monitored, well-tolerated, and effective then this is good treatment. I do try and do a careful job between 30mg and 60mg of Adderall for my stimulant patients as there is unlikely significant benefit difference in that range. Sometimes reaching for higher indicates a need to reset expectations, reexamine diagnostic impression/comorbidities, or consider an alternate treatment/adjunct. Personally, I see a lot more problem in under-dosing and demanding only ER formulations be used in all cases.
All that said, a high rx rate for stimulants certainly suggests you should look into whether or not they are indicated more closely on an individual basis.