I agree changing parks every year does introduce an element of unrealism. However I don't see that as any more unrealistic than making roster moves (trades, draft picks, cuts, etc)after knowing what a player's stats will be for an entire season. For those who want more realism, play real time. For those like myself who prefer traditional leagues, choosing a park adds one more element of strategy to the game. You should also keep in mind that the number of parks you can move to are limited to 10 or 6 depending on league size so I suspect that turnover in parks is minimal. I have had three parks in seven years with one team and two parks in six years with my other team. Neither team is planning on moving this offseason. I am curiious to learn what others think on this issue.