For those with a passport from the EU / North America, this is not a problem. Further, those working for an airport will not want to get involved in any kind of visa policing. In addition, Govt immigration officials care only about who is entering or leaving their own country - not whether they have the right to enter the country to which they are going.
Surprisingly they already do at Airports and think the figure is £2000 rather than £10000 but thats details.
Quite a few of the service providers at Airports incentivise the staff to hold back people with incorrect Visa's. As is pretty likely the airlines will force people like Servisair etc to pay the fine as they checked someone through then getting people like this held way before boarding is worth the £25 bonus to the checking staff.
I can only guess that using the checkin kiosks will flag whether someone has correct VISA or not as believe they are regesitered.