To be fair Chris the circumstances you describe are pretty unique and as Kev has pointed out they are one of the very strongest towers on the market.
The AE carbon ones range from £13/18, Yokomo ones range from £15/22 and the Schumacher ones range from £15/17 per tower but all of them are between half to a third of the size of our rear tower on the Squared, plus our tower is 4mm thick and not 3mm like most other brands (which snap far easier), which does put the cost up hugely by being so much thicker.
The current UK RRP is £22.49, which most of our dealers sell if for (or less), the only time it went up to more was last year when the pound suffered badly with the exchange rates being as low as 1.3 ish against the dollar.
We did look at making it 3mm (like most other brands) but opted for the stonger and thicker 4mm and as a result sell very few at all as spare parts (the 3mm one we looked at was going to be £15.99) but the choice to have strength and have to replace very few (if any at all) in the life of the car ruled out this part ever being made...... (would you prefer to buy several at £15.99 or maybe the very odd one at £22.49?)
As far as being as expensive as a Ferrari....... not too sure they are "that" bad
