Anyone would be taking a chance booking on that with the possibility of ET and Pens!
Knowing how long it takes to get out and on to a train or tube after the match you'd be stressed and hoping to make it.
Might have more chance getting the Tube to Watford but then you would risk not being allowed on if the train is full and standing!
Throw in the train ticket you would need to buy, probably an open return ( more expensive) because you couldn't guarantee making that train.
If you did make it, you are still only stuck at Piccadilly near 2300 on a Sunday night with the probable need to get a Taxi or your car, having paid a fortune to park it all day.
That 90 minutes may not seem like much but it severely limits travel options home.
What looks good and achievable on paper (or more likely online) is far from straightforward and will cost a fortune for a thoroughly miserable and expensive day.
As I say, most people like to make a day of it. It may include a drink or whatever else people like to do.
Just making your way straight to the match and straight home with your sandwiches is boring as fuck, (not that it is easy to do) and still costing you the best part of £150.00.