  We study two realisations of the Fake Split Supersymmetry Model (FSSM), the
simplest model that can easily reproduce the experimental value of the Higgs
mass for an arbitrarily high supersymmetry scale, as a consequence of swapping
higgsinos for equivalent states, fake higgsinos, with suppressed Yukawa
couplings. If the LSP is identified as the main Dark matter component, then a
standard thermal history of the Universe implies upper bounds on the
supersymmetry scale, which we derive. On the other hand, we show that
renormalisation group running of soft masses above the supersymmetry scale
barely constrains the model - in stark contrast to Split Supersymmetry - and
hence we can have a "Mega Split" spectrum even with all of these assumptions
and constraints, which include the requirements of a correct relic abundance, a
gluino life-time compatible with Big Bang Nucleosynthesis and absence of
signals in present direct detection experiments of inelastic dark matter. In an
appendix we describe a related scenario, Fake Split Extended Supersymmetry,
which enjoys similar properties.

High Energy Physics - Phenomenology