The per-person limit is already only $2,700, and only people can give money (not companies), so direct contributions are not particularly compelling as a path for corruption. Plus, quid pro quo is already illegal.
Candidates are far more concerned about 3rd party money than direct donations these days, because 3rd party spending is unlimited. Quid pro quo is not necessary because it's all done in public. You don't need a secret meeting with a lobbyist to know if the NRA likes your position on guns. Just watch the ads.
Of course not every House member has to worry about this; in fact most don't. Most of the big spending on House races is concentrated in the few districts that everyone expects to shift the balance. This would still be true in a House of 35,000. While most races would probably get less expensive, there would still be a small set of "tipping point" races that would attract most of the effort and money.
Campaign donations are only one form of bribery. There are in-kind gifts, and cash gifts to family and friends, and "consulting contracts" given after the politician resigns.
Not necessarily; it only takes a one-vote margin to pass legislation in the House.
Quite a lot of House races are on "auto pilot", politically--that is, there's not much suspense about which party's candidate is likely to win. This is in part because of gerrymandering that produces districts favorable to one party vs another.
Tiny districts would be like gerrymandering on steroids. It wouldn't take much fancy geometry to produce a map in which the vast majority of House races remain easily predictable. And it is the marginal (unpredictable) races that atract the bulk of the big spending.
Candidates are far more concerned about 3rd party money than direct donations these days, because 3rd party spending is unlimited. Quid pro quo is not necessary because it's all done in public. You don't need a secret meeting with a lobbyist to know if the NRA likes your position on guns. Just watch the ads.
Of course not every House member has to worry about this; in fact most don't. Most of the big spending on House races is concentrated in the few districts that everyone expects to shift the balance. This would still be true in a House of 35,000. While most races would probably get less expensive, there would still be a small set of "tipping point" races that would attract most of the effort and money.