They definitely reinvest money earned from sales.
Not sure that their current squad shouldn't be where it is, They have done similar to Rovers and replaced those who have left with players without Championship experience from overseas, Albeit at a much higher price (Harry Darling being the exception and their equivalent of Sean McLoughlin in terms of someone with Championship knowhow). Sergeant is a stand out player at this level, but many of their new signings look substandard/inexperienced at this level, and Medic/Duffy in their central defence make Pickering look like Usain Bolt