Mistwell
Crusty Old Meatwad
Once you are started, you don't need or use the starter set any more - at that point, you're using Basic, which is free. It isn't really replayable, any more than any other adventure module is replayable.
Your view of the starter set seems to contradict what WOTC is saying about the starter set.
From today's L&L:
Mike Mearls said:As a secondary goal, the Starter Set must also provide long-term value. In the past, intro sets for RPGs have often been focused on a stripped-down adventure scenario and a limited version of the rules that becomes irrelevant once players move on to the full version of the game. We wanted this new set to be something you could keep on your shelf and use again in the future.
...The Keep on the Borderlands is the classic adventure bundled with the 1981 D&D Basic Set. The locations and encounter scenarios introduced in that adventure have stood the test of time, with DMs still using them to run games today. With that in mind, we decided to focus on making the adventure the key component of the Starter Set. A good adventure sees use again and again.
...We wanted an adventure with a bit of direction to launch a campaign, which could then segue to a more open-ended approach after a play group has a couple of game sessions under its belt.
...In addition, it makes a handy table reference for things like equipment and combat rules, and we expect that DMs who move on to Basic D&D or the three core rulebooks will continue to use the Starter Set rulebook as an extra resource during play.