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It also means you need faster servers to cope with the higher load, since overloaded shaping equipment has been known to cause congestion issues in the past.

As for maintenance, any enterprise/carrier network administrator worth his salt has everything automated anyway, so economies of scale mean additional units cost zero maintenance. The only issues that wouldn't scale that way would be hardware issues, which would normally be dealt with by the vendor support contract anyway (unless VM like acting macho and taking them on in-house)

I'm a bit confused though as to whether we're talking about equipment at the internal edge, i.e. customer-facing end or at the external edge, i.e. border-gateways. I'm also confused what these TMS servers do. STM as far as I know is implemented on the UBR and nowhere near the peering links, P2P shaping on the other hand, has nothing to do with STM.