these expenses will increase by 700 times and it is not going to end here, rather Allah عَزَّوَجَلَّ says in the Glorious Quran:

وَ اللّٰہُ یُضٰعِفُ لِمَنۡ یَّشَآءُ ؕ

 ‘Allah may increase it still more than this, for whomever He wills’

For encouragement, let us listen to more parables of the generosity of the Noblest Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم so that we have desire to spend in the way of Allah عَزَّوَجَلَّ by serving the Muslims, Masajid, Madaris and for propagating Deen-e-Islam.  

The parable of generosity of the Noblest Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم

In the battle of Hunayn, the most distinctive kind of generosity shown by the Beloved Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم can never be imagined at all. The Noblest Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم granted many Bedouins (those living in villages) 100 camels each. (Bukhari, Hadees 4337)

Before reverting to Islam (on the occasion of the battle of Hunayn), Safwan Bin Umayyah رَضِىَ اللهُ تَعَالٰی عَـنْهُ asked for nanny goats which were spread over the area of Jungle between the two mountains. The Noblest Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم granted him all those nanny goats. He went to his people and said: “O my people! All of you embrace Islam! I swear by Allah عَزَّوَجَلَّ! The Noblest Prophet صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم shows such generosity, after which there remains no fear of poverty.’ (Mishkat, Hadees 5806)

Sa’eed Bin Musayyab رَضِىَ اللهُ تَعَالٰی عَـنْهُ has narrated, Sayyiduna Safwan Bin Umayyah رَضِىَ اللهُ تَعَالٰی عَـنْهُ has stated: On the day of the battle of Hunayn, Rasoolallah
صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم granted wealth upon me whereas (at that moment) he was the most hateful person in my eyes. He continued to grant wealth upon me until he became the most beloved person in my eyes.

(Sunan Tirmizi, vol. 2, pp. 147, Hadees 666)