You will find most of the recruiters have a whole host of trackers that they are members of. So if they go on and check your profile and see that your stats have been faked, this will obviously lead to you not receiving an invite but there may be further repercussions with your registration on that site
I agree with you on some trackers it is nearly impossible to get a 1:1 ratio on each torrent. But I think that's why a lot of trackers are going ratioless and others are providing options to maintain ratio such as freeleech and bonus points. I think this should be a requirement on all trackers, as the onus should not be on the user to reach a 1:1 ratio, but to ensure they are seeding for a minimum amount of time and avoiding hit & runs.
I will say on some of the most difficult trackers to maintain ratio, a seedbox set up with RSS or autodl-irssi is almost a necessity unfortunately.
Why should trackers not punish you for inviting bad users? Trackers don't have to give out invites, but when they do, you are responsible for choosing people that will contribute to the community. Also, trackers will not ban you immediately for inviting one bad user. They will give you a warning, and only when they can tell that you have a systematic problem with the people you invite, will they consider punishing you. But even then, they will probably only revoke your invite privileges. I think its important that trackers have a disciplinary system in place because it incentivizes users to make sure they do their due diligence when inviting others. Otherwise you'll see invites flying around all over the place, and it is the tracker that suffers because of the larger proportion of bad users.
I'm not lucky enough to have a fast home connection, but that's why I invested in a seedbox. I understand this isn't attainable for everyone, so it is right that trackers are lowering their requirements or going ratioless, and at the very least providing other means of building ratio. The ones that fail to do either will die a slow and painful death.
On recruiters, I have no idea what they look for but I hope that ratio isn't the only requirement. If I were a recruiter, I'd invite the guy who seeds 24/7 on his home connection, has a few uploads to his name and has a genuine interest in the tracker being offered, over the guy who has a seedbox and just downloads freeleech torrents to build his ratio and is only interested in amassing a collection of trackers.