Can the founder of an endowment have the benefit of his endowment?

Narrated Anas:

The Prophet (ﷺ) saw a man driving a Badana (i.e. camel for sacrifice) and said to him, "Ride on it." The man said, "O Allah's Messenger (ﷺ) ! It is a Bandana." (The Prophet (ﷺ) repeated his order) and on the third or fourth time he said, "Ride it, (woe to you" or said: "May Allah be merciful to you).

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ ـ رضى الله عنه ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم رَأَى رَجُلاً يَسُوقُ بَدَنَةً، فَقَالَ لَهُ ‏"‏ ارْكَبْهَا ‏"‏‏.‏ فَقَالَ يَا رَسُولَ اللَّهِ إِنَّهَا بَدَنَةٌ‏.‏ قَالَ فِي الثَّالِثَةِ أَوِ الرَّابِعَةِ ‏"‏ ارْكَبْهَا، وَيْلَكَ، أَوْ وَيْحَكَ ‏"‏‏.‏

Narrated Abu Huraira:

Allah's Messenger (ﷺ) saw a man driving a Badana and said to him, "Ride on it," and on the second or the third time he added, "Woe to you."

حَدَّثَنَا إِسْمَاعِيلُ، حَدَّثَنَا مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم رَأَى رَجُلاً يَسُوقُ بَدَنَةً، فَقَالَ ‏"‏ ارْكَبْهَا ‏"‏‏.‏ قَالَ يَا رَسُولَ اللَّهِ إِنَّهَا بَدَنَةٌ‏.‏ قَالَ ‏"‏ ارْكَبْهَا، وَيْلَكَ ‏"‏‏.‏ فِي الثَّانِيَةِ أَوْ فِي الثَّالِثَةِ‏.‏