Some people find it difficult to believe, but SBPE is one of those rare sims or games that stays on hard drives indefinitely. The price per actual use of the sim declines with the actual use of it, which means it soon becomes a cheaper investment than a great many sims and games. *Almost* every sim and game ever made is essentially over within a relatively short period of time. With the exception of a few classics such as Falcon 4, Jane's F/A-18, and precious few others, they last a matter of months, maybe a year or so. You paid the full price, and now its a fond or not so fond memory.
SBPE is not like that. Nearly annual expansions (remember those? One or two $15, $25 or $30 boxed add on disks after a few months?), continue to add new player useable AFVs, more non player AFVs, improvements across the board, and bug fixes. The active community builds well made new scenarios regularly, and multiplayer sessions are plentiful.
Heck - console games that aren't even sims cost $60. And this is far from a toy!
If $100 is what it takes to make a superior quality, long-lived sim that is expanded annually, please make more of them!!