Should be only few suggestions to make many animations quickly in low budget:
- Avoid 3ds Max bones, use Biped system with Skin modifier, so you don't have to spend much time creating the rig.
- Plan your game design adjusted to your possibilities: I mean, simple character models, without complex effects like hair, clothes and face expression morphs.
- Since motion capture is expensive you can use reference videos inside your scene putting them in a plane's texture to help you creating animation keys.
- Use MaxScript to solve repeating task. MaxScript is easy to learn. And there is lot of free plugins at: http://www.scriptspot.com/
There is lot of work involved you can't avoid if you want to create original content, unless you choose the expensive way:
The really fast quick approach is to use a service like: http://www.mixamo.com/ There you upload your model, auto-rig it and apply animation in less than 3 minutes each one. They have a database of motion captures and also provide custom motions.