You need to look up how they kept consolidating. It was appeasing new “citizens” that had no ties or care about the future of the empire.
". Its organization was descended from that of early Roman Army, and the centuries were organized into tiers rank and property with cavalry equites at the top and unarmed and unpropertied at the bottom. "
Elections in the Roman Republic - Wikipedia
"The first property class and the equites combined for 98 votes, and if they were unanimous a candidate would be declared elected and no other centuries would vote. If no majority was reached, balloting would continue through the lower property classes until a majority was reached"
"Elections in the Roman Republic were often characterized by tension between the patricians and the plebeians and, as modern scholarship has shown, were dominated by the oligarchic elite"
Sounds like the really opened up voting to the masses with less than 10% voting.
"From what we know of how the voting was structured historians have estimated that at most between 6,000 and 16,800 could have voted in that election. With an electorate of 910,000, even the most generous guesses put voter turnout below 10%.[25]"
They may have thrown out empty promises, they were politicians. But it wasnt some great upselling of voters that doomed the interest of Rome. It was the landed elite who constantly took power away from the rest of Roman's with their control of voting