Even if you are cynical, lets assume that they have a run of some underperformance from their 400%.
Lets say they only manage a paltry 200% per week ( 5 days ).
200% per 5 days. £100 starting capital. re-investing gains.
after 1 week: £100 becomes £300.
after 2 weeks: £300 becomes £900.
after 3 weeks: £900 becomes £2,700.
after 4 weeks: £2,700 becomes £5,100.
after 5 weeks: £5,100 becomes £15,300.
after 6 weeks: £15,300 becomes £45,900.
after 7 weeks: £45,900 becomes ...... ??
If I could do this, I wouldnt waste my time posting on T2W, as I would be too busy deciding which colour interior I wanted on my Lambourghini.