Yes many modern guns need break in and the manufacturers have even stated they could take 500rds to do so.
I bought 600 rounds of 9MM NATO about a month ago for $200 at a local Farm and Home store.With 50 rounds to a box costing $50 or more, 500rds would equal 10 boxes for about $500 plus shipping. Based of that I believe a lot of new pistols will stay in pristine condition for a long time!