I've never heard of anybody successfully self-fertilizing these either. On the other hand I've not found anything conclusive that these are self-incompatible - other than the lack of reports of success in self-fertilization.
From what I've read this species wasn't included in the study of self-incompatibility in Australian Drosera.
I repotted some into a deeper pot last year. One of those is starting to flower this year. It looks like deeper pots may make a difference. I think Stephen Morley may have found one of the keys to getting these to flower. The plants in this pot are not making offshoots in the numbers that this species does in shallower pots.
Many-of-Us IN-This-Country Have Discovered THART Extremely WIDE-Pots Encourage The Adventitious Side-Runners to-Set More Tubers so-to-Speak IE The-Longer-They-R 'Allowed' to-Grow The More-Tubers You-Get so-to-Speak!!!!
Great, did someone over there notice if you bend or push the D. gigantea bush halfway under the moist sand, every leaf under the sand sets a new tuber as the plant goes dormant?
You can make several dozen clones each year using this method, a'la D. capensis. Timing is important, you want to do this when the plant has fully grown out the first set of leaves. When the second and third sets develop under the sand, the venation is different and this lets them each set a tuber. I also believe it has to be rather clear sand for some light transmission.
It would be so nice to start a new political party. Maybe name it, The Tea Party II for Americans, not racist anti-American douches that hate their neighbors? We need to reform our politics, not make them more partisan and dumber.