Nah not buying it.
Last season 18 teams in the country got higher attendances than us: Celtic, Rangers, Kilmarnock, Aberdeen, Hibs, Hearts, St Johnstone, Motherwell, Livi, Hamilton, St Mirren, Dundee, Ross County, Dundee United, ICT, Partick Thistle, Dunfermline and Falkirk.
All of them have all seater stadia but the only clubs there that weren’t historically better supported than Ayr are Livi, Hamilton, Ross County and ICT. Livi and Hamilton both had lower home supports than us and just benefited from bigger away crowds (plus Livi are a bit of an anomaly since they’ve only been around in their current guise since the 90s). Ross County and ICT are also a different kettle of fish considering neither joined the big leagues until the 90s, both have much wider catchment areas than Ayr (particularly County) and County are essentially a millionaire’s plaything.
There is not a single club getting larger attendances than Ayr where you could say it’s down to them having a more modern stadium.