There are quite good reasons to not replace, not least of which is that replacement valves are nowhere as good as your native, particularly if it’s still functioning.
Ie if metallic, you need to be on anticoagulants for life which can be a massive pain and cause other complications. Metallic last for around 30 years.
If porcine/bovine or possibly human, then they degrade much faster, 10-15 Years is the average.
So, depending on your age, and depending on the repair your aorta needed, the surgeon likely decided that since you will have to undergo the knife at some point again anyway (either for graft replacement for the Dacron that now makes up the proximal part of your aorta) or eventually due to the valve, you might as well minimise the complexity by only doing one thing at a time.
Plus, since we first started doing TAVIs (transcutaneous aortic valve repairs) they are getting better and better - see article - so possibly you wouldn’t need the on-pump surgery.
Interesting that it costs you $160k; in the Australian public health system a valve is about $30k.
Source: I did my honours thesis on cardiothoracic surgery (actually on mitral valve repair, but spent a lot of time in cardiothoracic theatres dealing with aortic valve-disease)