First I am Gavra_at_work just not at work or home. This is learning, so I thought it worthwhile to post, so I borrowed a computer.
The Gemorah I described is a Rubah Dlesah Lkaman in the Hava Amina, but in the Maskana, it changes to a chazaka. The Shmytza in Shmaytza Daled (i think perek Zayin) says this case is a chazaka (due to the din of Muad applies to its state), and not a Rov. He is Mashma (I feel) that Tosfos in Sanhedrin daf 3b would argue and say it is still a Rov, but stronger (and therefore usable by Mammon) due to it not being Taloui in daas, rather in nature (similar to what I explained above regarding “in general”).
A more classic (and less confusing!) case is that Rov women give birth after nine months. This is not Lakaman (we have not counted), but the tevah is that most women give birth after nine months.
There is also the case there (on that sugyah) of a seed seller, who is assumes to sell it for planting due to the rov (the Rashbam there calls it a Rubah Dlesa Lekaman). That is a much more difficult case, as there you also have Rov Olam (similar to squeaks question) who buys to eat. Over there, it is Taloui in the daas of the buyer and seller, and is a weaker Rov.
The final Rov is the Rov of 9 stores which I brought earlier.
I have not gone through the entire sugyah, so there may be more.
Please feel free to add or refute, Torah He VLilmod Ani Tzarich.
Yasher Koach to all those who post here.