That is the conclusion of The Times this morning, which calculates that of the £52 million received into party coffers over the last three years, "a growing proportion" has come in the form of individual donations of £50,000.
According to the paper's analysis of Electoral Commission figures:
However, it would seem that there is still some way to go before it becomes viable to introduce a £50,000 cap on donations - which David Cameron aspires to introduce and about which I expressed my scepticism quite recently.
Whilst the number of people giving £50,000 donations has increased over the last three years, The Times also notes a recent pledge of £1 million from Stanley Fink and the fact that the amount of money channelled into the party through Lord Ashcroft's company, Bearwood, has also increased during the that time:
How broad will that growing donor base remain as the recession continues to bite?