Donor egg IVF has a higher success rate than surrogacy

 Women feel much more connected to their embryos than to their uterus, so much so that they even refer to their embryos as “embies” since they ultimately develop into babies. This is unlike the uterus, which many women blame for a lot of things; from their menstrual periods ; to infertility; to miscarriages; and failed IVF cycles.

What many IVF patients fail to realize is that it's usually not the uterus which is at fault when an IVF cycle fails. It is because they harbour this delusion that patients who have failed IVF cycles decide to opt for surrogacy.

The reality is that when embryos do not implant, it is usually because of a genetic problem in the embryo, and nature prevents this embryo from implanting, so as to prevent the development of babies with genetic abnormalities. Even if these embryos were to be transferred to a surrogate’s uterus, the cycle would still fail. 
 These genetic abnormalities are much commoner in older women, because their eggs have aged.

There is always the possibility of using Comprehensive Chromosomal Screening (CCS), but this will not detect all the genetic defects in embryos . 

For most older women who have failed many IVF cycles, the option with the highest pregnancy rate would be to go in for donor eggs. However, they do not realise this, and when they seek a second opinion from another clinic, and ask for surrogacy treatment, most doctors are happy to do surrogacy for these patients, because this is much more profitable for them.