Is it advisable to deploy LTM & ASM on one Box?

I've been discussing this with my F5 sales team. Basically its a matter of resources. In order for ASM to look at https traffic the traffic needs to be decrypted. If you are already doing ssl termination as part of the LTM, there's a lot to be said for having ASM on the same box so it only has to be unencrypted and reencrypted once. However doing the LTM function and the ASM function on the same box obviously takes more CPU/memory etc than just LTM.