Also they would be impossible to level, and nudging them would damage the cab and bend the legs, but at least you slightly reduced the already negligible risk of them being stolen I guess.

yeah, in my opinion, the math just doesn't work out for anything beyond a normal security system if the games are in your home (on location or in a remote location is a different story).

in a basement, the games are already not going to be stolen by a random thief -- those guys are after stuff that is easy to carry, and easy to anonymously resell. (and they are, as a rule, NOT criminal masterminds.)

if your machines do get stolen out of your home, it'd almost have to be from a planned attack by someone who knows you have them, knows what they're worth, knows when you won't be home, and has at least one accomplice willing to help. and in that eventuality, they are going to come prepared, so any measures trying to bolt or chain the game down will be easily defeated.

In any kind of security, there is a point of diminishing returns: a minimal effort reduces risk by a large amount, and increased efforts are expensive and time consuming and tend to only reduce the remaining risk by a little bit. for example, in preventing burglary, a simple security system on the doors and windows that blares a siren and phones the police is enough to get rid of the vast majority of break-in attempts. Further measures only reduce the risk by a little bit, because any thief savvy enough to circumvent these things has a good chance of being prepared in other ways, such as being an inside job. there is an old law in security -- only way to make something 100% secure is to do without it.

how likely you are to be a target is also dependent on the quality of your neighborhood, but what puts your *pins* at risk isn't the frequency of random breakins -- it's more to do with how many junkies and scumbags you personally know. they are more likely to target your pins than random burglars.

the other half of that equation is the value of what is actually at risk -- it doesn't make sense to spend extraordinary resources to protect things of little to moderate value, or to protect assets that are insured anyway. it does make sense to take extraordinary measures, though, if the risk is to human life, or to something truly irreplaceable.